are in use simultaneously, the CPU utilization may increase non-
linearly. In order to limit the CPU utilization without impacting
the overall throughput, we recommend that you load the driver as
- follows:
+ follows::
modprobe e1000 InterruptThrottleRate=3000,3000,3000
RxDescriptors
-------------
-Valid Range: 80-256 for 82542 and 82543-based adapters
- 80-4096 for all other supported adapters
+Valid Range: 48-256 for 82542 and 82543-based adapters
+ 48-4096 for all other supported adapters
Default Value: 256
This value specifies the number of receive buffer descriptors allocated
TxDescriptors
-------------
-Valid Range: 80-256 for 82542 and 82543-based adapters
- 80-4096 for all other supported adapters
+Valid Range: 48-256 for 82542 and 82543-based adapters
+ 48-4096 for all other supported adapters
Default Value: 256
This value is the number of transmit descriptors allocated by the driver.
higher number of transmit descriptors may be denied. In this case,
use a lower number.
-TxDescriptorStep
-----------------
-Valid Range: 1 (use every Tx Descriptor)
- 4 (use every 4th Tx Descriptor)
-
-Default Value: 1 (use every Tx Descriptor)
-
-On certain non-Intel architectures, it has been observed that intense TX
-traffic bursts of short packets may result in an improper descriptor
-writeback. If this occurs, the driver will report a "TX Timeout" and reset
-the adapter, after which the transmit flow will restart, though data may
-have stalled for as much as 10 seconds before it resumes.
-
-The improper writeback does not occur on the first descriptor in a system
-memory cache-line, which is typically 32 bytes, or 4 descriptors long.
-
-Setting TxDescriptorStep to a value of 4 will ensure that all TX descriptors
-are aligned to the start of a system memory cache line, and so this problem
-will not occur.
-
-NOTES: Setting TxDescriptorStep to 4 effectively reduces the number of
- TxDescriptors available for transmits to 1/4 of the normal allocation.
- This has a possible negative performance impact, which may be
- compensated for by allocating more descriptors using the TxDescriptors
- module parameter.
-
- There are other conditions which may result in "TX Timeout", which will
- not be resolved by the use of the TxDescriptorStep parameter. As the
- issue addressed by this parameter has never been observed on Intel
- Architecture platforms, it should not be used on Intel platforms.
-
TxIntDelay
----------
Valid Range: 0-65535 (0=off)
-Default Value: 64
+Default Value: 8
This value delays the generation of transmit interrupts in units of
1.024 microseconds. Transmit interrupt reduction can improve CPU
-------------
(This parameter is supported only on 82540, 82545 and later adapters.)
Valid Range: 0-65535 (0=off)
-Default Value: 64
+Default Value: 32
This value, in units of 1.024 microseconds, limits the delay in which a
transmit interrupt is generated. Useful only if TxIntDelay is non-zero,
---------
Valid Range: 0-xxxxxxx (0=off)
Default Value: 256
-Usage: insmod e1000.ko copybreak=128
+Usage: modprobe e1000.ko copybreak=128
Driver copies all packets below or equaling this size to a fresh RX
buffer before handing it up the stack.
Allows PHY to turn off in lower power states. The user can turn off
this parameter in supported chipsets.
-KumeranLockLoss
----------------
-Valid Range: 0-1
-Default Value: 1 (enabled)
-
-This workaround skips resetting the PHY at shutdown for the initial
-silicon releases of ICH8 systems.
-
Speed and Duplex Configuration
==============================
------------
Jumbo Frames support is enabled by changing the MTU to a value larger than
the default of 1500. Use the ifconfig command to increase the MTU size.
- For example:
+ For example::
ifconfig eth<x> mtu 9000 up
This setting is not saved across reboots. It can be made permanent if
- you add:
+ you add::
MTU=9000
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